High tension apparatus



P 1931- DI. MULLVER-HILLEBRAND 1,824,818

HIGH TENSION APPARATUS Filed April 21. 1928 INVENTOR Diefr/c/r Mu/ler Hfl/ebmnd A rro'RA/Ey Patented Sept. 29, 1931 UNITED STATES PATENT OFFICE DIETRICH MULLER-HILLEBRAND, OF BERLIN-CHARLOTTENBURG, GERMANY, ASSIGNOR T WESTINGHOUSE ELECTRIC 8: MANUFACTURING COMPANY, A CORPORATION OF PENNSYLVANIA HIGH TENSION APPARATUS Application filed April 21, 1928, Serial No. 271,722, and in Germany April 22, 1927.

My invention relates to a high-tension apparatus composed of aplurality of individual parts, in which metallic members are arranged between the high-tension electrodes. The object of my invention is to increase considerably the flashover voltage of such a paratus.

In the rawings ailixed hereto and forming part of my specification are illustrated two embodiments of my invention.

.ln'the drawings:

Fig. 1 is a sectional side-elevation of an upright porcelain support, and

Fig. 2 is a rotary type disconnecting or isolating switch in elevation, to which my invention is applied.

It is well known thatthe flashover voltage between two electrodes of electric hightension apparatus is lower than corresponds with the sparking distance, if metal parts are located in air between the electrodes. The reason is that such metal parts represent intermediate electrodes. In the case of supporting insulators composed of a plurality of parts metal rings are arranged at the joints and keep the individual ceramic parts of the support together. In the case of rotary disconnecting switches the intermediate electrode consisting of metal is formed by the switch knife mounted on the central one of the three supporting insulators and occupying the open position. In order to increase the fiashover voltage in such high-tension apparatus it is necessary to increase the spacing of the electrodes from the intermediate electrodes. At very high voltages comparatively large distances between parts are attained in this way, whereby the space requirement for hightension apparatus is considerably increased.

According to my invention an increase of the electrode s acing is avoided and an increase of the fihshover voltage attained by coating or enveloping the metal parts with an insulating material. In the case of rings, as in the first mentioned example of the supporting insulator, these rings are completely covered with an insulating material. In the case of rotary disconnecting switches the switch knives are covered with an insulating material almost in their entire length, so that only the ends, which make the contact, project from the insulating material. The parts, which serve for mounting the insulating material upon the metal parts, are likewise constructed of insulating material. As insulating materials there may be employed the known highgrade insulating materials, but also insulating materials of the second order, as long as the insulating capacity suffices for the case in question.

Referring to Fig. 1 of the drawings showing as an example of a high-tension device according to my invention a supporting insulator, it will be seen that this insulator is composed of three ceramic or porcelain parts 2, 3 and 4. The electrodes are formed by the cap 5 and the base 6. On the joints of the individual ceramic parts of the support there are provided metal rings 7 into which the individual parts may be cemented. According to my invention these rings are covered with an insulating layer or covering 8. v

In Fig. 2 is illustrated as example for the application of my invention a rotary disconnecting or isolating switch of the usual or any other suitable construction. On a base 10 are mounted the three supporting insulators 12, 13, 14. The central support, which carries the switch knife 17, can be turned from the closed position shown in the drawing into the open position by turning the shaft 11. According to my invention the knife 17 of the switch is covered with or enclosed by a layer of insulating material.

Various modifications and changes may be made without departing from the spirit and the scope of the invention, and I desire, therefore, that only such limitations shall be placed thereon as are imposed by the prior art.

I claim as my invention 1. In combination, in outdoor high-voltage apparatus, spaced weather-exposed electrodes, a conducting element therebetween in spaced relation thereto, and means including a dielectric covering on a portion of said element providing closer spacing between "the electrodes than is permissible With said portion exposed.

2. In combination, in outdoor high-voltage apparatus, spaced Weather-exposed electrodes, a conducting element therebetween movablerelative thereto between a. position operatively connectlng the. electrodes and a.

position spaced therefrom, and means in- .cluding a dielectric covering on a portion of saidelement providing closer spacingbetweenthe electrodes than is permissible with said portion exposed.

3. In combination, in an outdoor highvoltage switch, laterallyspaced insulating columns, a contact member'mount'ed on one of. the columns, a switch'arm carried by another of the columns, and-means includ ing an insulating cover on said arm providtubular insulating element covering the arm from a pos1t1onad acent to its column to a v having aside Opening, a contact member I mounted in; SZLlCl tubular portlon opposite rsaid-opening, and a switch arm carried by :{permissible with said, arm exposed.

ing closer spacing; of the columns than is 4. InI combination, in an outdoor highvoltage switcln. laterally-spaced insulating columns, a contact member-mounted on one of the columns, a switch arm extending radially into another-ofv the columns, and a position adjacent to a contact portion of the arm'for co-operationithsaid contact member.

5.1m combination, in an outdoor high voltage switch, laterally-spaced insulating columns, a contactmember mounted on one ot' the columns, a switch arm extending radially through another of the columns,

and tubular; insulating means covering a portion ot the arm and extending oppositely, from its column.

6. In combination, in an outdoor high voltage switch, laterally-spaced? lnsulating columns including metal elements, 'one of,

said columns embodying a tubular portion another. of the cohunns and having a co operating contact portion movable, through said opening;

In: testimony- Whereof, I h ave hereunto subscribed. myname this 31st day of March,v

1928'," at- Berlin- Siemensstadt, Germany. DIETRICH MULLER-HILLEBRAND. 

